protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
{
TreeGridNode node = this.OwningNode;
if (node == null)
{
return;
}
Image image = node.Image;
if (this._imageHeight == 0 && image != null)
{
this.UpdateStyle();
}
// paint the cell normally
base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts);
// TODO: Indent width needs to take image size into account
Rectangle glyphRect = new Rectangle(cellBounds.X + this.GlyphMargin, cellBounds.Y, INDENT_WIDTH, cellBounds.Height - 1);
int glyphHalf = glyphRect.Width / 2;
//TODO: This painting code needs to be rehashed to be cleaner
int level = this.Level;
//TODO: Rehash this to take different Imagelayouts into account. This will speed up drawing
// for images of the same size (ImageLayout.None)
if (image != null)
{
Point pp;
if (_imageHeight > cellBounds.Height)
{
pp = new Point(glyphRect.X + this.glyphWidth, cellBounds.Y + _imageHeightOffset);
}
else
{
pp = new Point(glyphRect.X + this.glyphWidth, (cellBounds.Height / 2 - _imageHeight / 2) + cellBounds.Y);
}
// Graphics container to push/pop changes. This enables us to set clipping when painting
// the cell's image -- keeps it from bleeding outsize of cells.
System.Drawing.Drawing2D.GraphicsContainer gc = graphics.BeginContainer();
{
graphics.SetClip(cellBounds);
graphics.DrawImageUnscaled(image, pp);
}
graphics.EndContainer(gc);
}
// Paint tree lines
if (node._grid.ShowLines)
{
using (Pen linePen = new Pen(SystemBrushes.ControlDark, 1.0f))
{
linePen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;
bool isLastSibling = node.IsLastSibling;
bool isFirstSibling = node.IsFirstSibling;
if (node.Level == 1)
{
// the Root nodes display their lines differently
if (isFirstSibling && isLastSibling)
{
// only node, both first and last. Just draw horizontal line
graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2);
}
else if (isLastSibling)
{
// last sibling doesn't draw the line extended below. Paint horizontal then vertical
graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2);
graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2);
}
else if (isFirstSibling)
{
// first sibling doesn't draw the line extended above. Paint horizontal then vertical
graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2);
graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.X + 4, cellBounds.Bottom);
}
else
{
// normal drawing draws extended from top to bottom. Paint horizontal then vertical
graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2);
graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top, glyphRect.X + 4, cellBounds.Bottom);
}
}
else
{
if (isLastSibling)
{
// last sibling doesn't draw the line extended below. Paint horizontal then vertical
graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2);
graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2);
}
else
{
// normal drawing draws extended from top to bottom. Paint horizontal then vertical
graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2);
graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top, glyphRect.X + 4, cellBounds.Bottom);
}
// paint lines of previous levels to the root
TreeGridNode previousNode = node.Parent;
int horizontalStop = (glyphRect.X + 4) - INDENT_WIDTH;
while (!previousNode.IsRoot)
{
if (previousNode.HasChildren && !previousNode.IsLastSibling)
{
// paint vertical line
graphics.DrawLine(linePen, horizontalStop, cellBounds.Top, horizontalStop, cellBounds.Bottom);
}
previousNode = previousNode.Parent;
horizontalStop = horizontalStop - INDENT_WIDTH;
}
}
}
}
if (node.HasChildren || node._grid.VirtualNodes)
{
try
{
// Paint node glyphs
if (node.IsExpanded)
{
node._grid.rOpen.DrawBackground(graphics, new Rectangle(glyphRect.X, glyphRect.Y + (glyphRect.Height / 2) - 4, 10, 10));
}
else
{
node._grid.rClosed.DrawBackground(graphics, new Rectangle(glyphRect.X, glyphRect.Y + (glyphRect.Height / 2) - 4, 10, 10));
}
}
catch
{ }
}
}
